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docs/themes.md

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+## Settings, Themes and colors
+
+*Nixy Theme:*
+
+Font:
+   Default: SF Apple
+   Mono: MesloLG Nerd Font
+   GTK Theme: FlatColor (Based on the colors in variables.nix)
+   QT Theme: Follow GTK
+   Icons:
+   Cursor:
+
+*Create your own:*
+
+In your hosts configuration, you should add a `variables.nix` file to manage your settings, including:
+
+- user information
+- timezone and locale
+- keyboard layout
+- the theme: will be used in programs and for GTK and QT themes
+- ... (check the `hosts/guest/variables.nix` file for more information)
+
+PS: To apply the theme to duckduckgo, follow the instructions in `$HOME/.duckduckgo-colorscheme.js`.
+